package cn.wl.gulimall.ware.service.impl;

import cn.wl.common.exception.NoStockException;
import cn.wl.common.to.mq.OrderTo;
import cn.wl.common.to.mq.StockDetailTo;
import cn.wl.common.to.mq.StockLockedTo;
import cn.wl.common.utils.R;
import cn.wl.gulimall.ware.entity.WareOrderTaskDetailEntity;
import cn.wl.gulimall.ware.entity.WareOrderTaskEntity;
import cn.wl.gulimall.ware.feign.OrderFeignService;
import cn.wl.gulimall.ware.feign.ProductFeignService;
import cn.wl.gulimall.ware.service.WareOrderTaskDetailService;
import cn.wl.gulimall.ware.service.WareOrderTaskService;
import cn.wl.gulimall.ware.vo.OrderItemVo;
import cn.wl.gulimall.ware.vo.OrderVo;
import cn.wl.gulimall.ware.vo.SkuHasStockVo;
import cn.wl.gulimall.ware.vo.WareSkuLockVo;
import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import cn.wl.common.utils.PageUtils;
import cn.wl.common.utils.Query;

import cn.wl.gulimall.ware.dao.WareSkuDao;
import cn.wl.gulimall.ware.entity.WareSkuEntity;
import cn.wl.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


//@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    WareOrderTaskService orderTaskService;
    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;
    @Autowired
    OrderFeignService orderFeignService;

    /**
     * 1.库存自动解锁
     * 只要解锁库存的消息失败，一定要告诉服务器解锁失败
     * @param to
     * @param message
     */
//    @RabbitHandler
    public void handleStockLockedRelease(StockLockedTo to, Message message, Channel channel) throws IOException {
        System.out.println("收到解锁库存的消息");

        StockDetailTo detail = to.getDetail();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        //解锁
        //1.查询数据库关于这个订单的锁定库存信息
        //没有：库存锁定失败，库存回滚了。这种情况无需解锁
        //有：证明库存锁定成功了
        //解锁：订单情况
            //1.没有这个订单，必须解锁
            //2.有这个订单。不是解锁库存 看订单状态如果是已取消解锁库存
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if(byId != null){
            //解锁
            Long id = to.getId();//库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode()==0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if(data==null||data.getStatus()==4){
                    //订单不存在 。订单已经被取消。才能解锁库存
                    unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                }
            }else{
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁
                channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
            }
        }else{
            //无需解锁
            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        }
    }

    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
        detailEntity.setId(taskDetailId);
        detailEntity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(detailEntity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            wrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 如果还没有这个库存记录就新增
        List<WareSkuEntity> list = this.list(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(list.size()==0 || list==null){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字,如果失败，整个事务不需要回滚
            //1.自己catch异常
            //TODO 还可以用什么办法让异常出现以后不会滚?
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0)
                    skuEntity.setSkuName((String) data.get("skuName"));
            }catch (Exception e){

            }
            this.save(skuEntity);
        }
        this.baseMapper.addStock(skuId,wareId,skuNum);
    }

    @Override
    public List<SkuHasStockVo> getSkusHashStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 1.下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁
     * @param vo
     * @return
     */
    //为某个订单锁定库存
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //1.按照下单的收获地址，找到一个就近仓库，锁定库存
        //1.找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSKuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        Boolean allLock = true;
        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if(wareIds==null||wareIds.size() == 0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId.toString());
            }
            //1.如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给MQ
            //2.锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id
            for(Long wareId:wareIds){
                //成功返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if(count==1){
                    skuStocked=true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(),taskEntity.getId(),wareId,1);
                    orderTaskDetailService.save(detailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity,stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败，重试下一个仓库

                }
            }
            if(skuStocked==false){
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId.toString());
            }
        }
        //3.肯定全部都是锁定成功过的

        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        //解锁
        //1.查询数据库关于这个订单的锁定库存信息
        //没有：库存锁定失败，库存回滚了。这种情况无需解锁
        //有：证明库存锁定成功了
        //解锁：订单情况
        //1.没有这个订单，必须解锁
        //2.有这个订单。不是解锁库存 看订单状态如果是已取消解锁库存
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if(byId != null){
            //解锁
            Long id = to.getId();//库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode()==0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if(data==null||data.getStatus()==4){
                    //订单不存在 。订单已经被取消。才能解锁库存
                    if(byId.getLockStatus()==1) {
                        //当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            }else{
                throw new RuntimeException("远程服务失败");
            }
        }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了,库存消息优先到期，查订单状态新建状态，什么都不做就走了
    //导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的库存， 进行解锁
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}